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What Is a Magnet? Houghton Mifflin Book F Chapter 15 Lesson 3 Pages 62-65 Essential Questions • Where do we find magnets in the real world? • Why does a magnet work differently on various objects? Pair Share: Take a few moments to discuss these essential questions with your partner. Main Idea • A magnet is an object that attracts certain metals. • A magnet has a magnetic field and magnetic poles. Properties of Magnets • What do you think would happen if you placed a magnet on a refrigerator door? • A magnet is an object that attracts certain metals, mainly iron. • This property of attracting iron and certain other materials is called magnetism. • The force of magnetism on objects decreases as the distance from the magnet increases. Q: Why Do Magnets Stick to Most Refrigerators? A: Magnets stick to most refrigerator doors because the doors are made of steel, which contains iron. • Magnets do not attract most other metals or materials such as plastic, wood, and rubber. Magnetic Fields • The space in which the force of a magnet can act is called its magnetic field. • The force of a magnet is greatest at two areas called the magnetic poles. • On a bar magnet, and a horseshoe magnet, the magnetic poles are at the ends. Bar Magnets • When a bar magnet is allowed to swing freely, one end always points towards the north. • The end of the magnet is the north-seeking pole, or north pole. • The other end of the magnet always points south. • This end is the magnet’s southseeking pole, or south pole. Pair Share • What will happen if you bring the unlike poles of two magnets near each other? • The unlike poles will attract each other and pull together until they touch. Earth as a Magnet –Earth acts like a giant bar magnet with two magnetic poles. –Earth is surrounded by a magnetic field with lines of force. –The north-seeking pole of a compass needle will turn until it points toward the magnetic north pole of the Earth. Pair Share • Question: How is Earth like a magnet? • Answer: Earth has magnetic poles and is surrounded by a magnetic field. Your Task • In your groups, make a poster to share with the other groups of what you learned in this lesson. • Each member of the group needs to share one thing they learned. • You will share your poster with the class. • When you are finished, you can read pages 62-65 in Book F.